My personal opinion is the lights that have special battery packs that you need to plug the headlight in to recharge are no good.
Far better off to use a light that uses a 18650 lithium ion battery, they have huge capacity and last a long time on each charge. Then you just carry a spare 18650 so that if you are ever caught out with your headlamp battery going flat you just swap in the spare battery.
The 18650 battery technology is so far superior to whats available in your standard AA's and AAA's its not funny.
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